<style>
    a:link {
        color: blue;
        text-decoration: none;
    }

    a:visited {
        color: blue;
        text-decoration: none;
    }

    a:hover {
        color: red;
        text-decoration: none;
    }

    a:active {
        color: black;
        text-decoration: none;
    }

    input {
        vertical-align: middle;
        height: 20px;
        outline: none;
        border-radius: 20px;
        background: #fff;
        border: 2px solid #008CBA;
        color: #000;
        padding-left: 10px;
        letter-spacing: 1px;
        transition: all 0.25s ease;
    }

    textarea {
        outline: none;
        border-radius: 20px;
        background: #fff;
        border: 2px solid #008CBA;
        color: #000;
        padding-left: 10px;
        letter-spacing: 1px;
        transition: all 0.25s ease;
    }

    button {
        box-sizing: content-box;
        vertical-align: middle;
        height: 20px;
        outline: none;
        text-align: center;
        border-radius: 20px;
        background: #fff;
        border: 2px solid #008CBA;
        color: #008CBA;
        padding-left: 10px;
        letter-spacing: 1px;
        cursor: pointer;
        transition: all 0.25s ease;
    }

    button:hover {
        background-color: #008CBA;
        color: white;
    }

    /*导航栏*/
    ul.navigation_bar {
        list-style-type: none;
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #006996;
    }

    ul.navigation_bar li {
        float: left;
    }

    ul.navigation_bar li a {
        display: block;
        color: white;
        text-align: center;
        padding: 14px 16px;
        text-decoration: none;
    }

    ul.navigation_bar li a:hover {
        background-color: #008CBA;
    }

    ul.navigation_bar li span {
        display: block;
        color: white;
        text-align: center;
        padding: 14px 16px;
    }

    ul li.navigation_bar_right {
        float: right;
    }
</style>
